In-plane conductive heat tansfer in solid and porous planar structures

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Show simple item record Miettinen, Lasse 2012-01-12T10:31:38Z 2012-01-12T10:31:38Z 2011
dc.identifier.isbn 978-951-39-4580-0
dc.identifier.issn 0075-465X
dc.identifier.uri en
dc.description.abstract Methods for determining the in-plane thermal diffusivity in a planar sample geometry were developed. These methods were tested and verified by measuring planar metal samples with known thermal properties. The techniques used were based on heating the sample at one edge and recording the evolution of the temperature field in the sample by a thermographic camera. The temperature fields at different times were processed and then fitted by a solution to a heat equation describing the experimental setup, thermal diffusivity as one of the fitting parameters. In the first experimental setup the sample was placed in a weak constant flow of air, and the situation was improved in the second setup by placing the sample in a vacuum chamber, where convective heat transfer was totally removed. After verification measurements, the latter setup was applied to porous sintered bronze samples, and their effective thermal conductivities were determined. The sintered samples were also imaged by X-ray microtomography so as to obtain a 3D model for their structure. It was shown that the effective thermal conductivity of the samples could be predicted by an analytical expression which involved certain parameters determined from the 3D images. Finally, as another application of the heat equation, propagation of temperature profiles in the form of slow-combustion fronts were studied in sheets of paper. The dynamical properties of these fronts belong to the KPZ universality class, for which theoretical results are available for the height-fluctuation distributions. Height fluctuations for such fronts were determined experimentally, and their distributions were found to be well fitted by corresponding theoretical distributions. fi
dc.format.extent verkkoaineisto (64 sivua).
dc.language.iso eng
dc.publisher University of Jyväskylä
dc.relation.ispartofseries Research report / Department of Physics, University of Jyväskylä no. 11/2011.
dc.relation.isversionof ISBN 978-951-39-4579-4
dc.rights openAccess fi
dc.subject.other thermal diffusivity
dc.subject.other thermal conductivity
dc.subject.other thermography
dc.subject.other slow combustion
dc.subject.other KPZ equation
dc.subject.other height fluctuations
dc.title In-plane conductive heat tansfer in solid and porous planar structures
dc.type Diss. fi
dc.identifier.urn URN:ISBN:978-951-39-4580-0
dc.subject.ysa lämpökamerat
dc.subject.ysa lämmön johtuminen
dc.subject.ysa lämmön siirtyminen
dc.subject.ysa diffuusio
dc.subject.kota 114
dc.type.dcmitype Text en
dc.type.ontasot Väitöskirja fi
dc.type.ontasot Doctoral dissertation en
dc.contributor.tiedekunta Matemaattis-luonnontieteellinen tiedekunta fi
dc.contributor.tiedekunta Faculty of Mathematics and Science en
dc.contributor.yliopisto University of Jyväskylä en
dc.contributor.yliopisto Jyväskylän yliopisto fi
dc.contributor.oppiaine fysiikka fi

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